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Energy and current waveforms of an intense electron beam passing through cavities
Author(s) -
Tomisawa Naru,
Nishiguchi Takashi,
Yamamoto Kensho,
Ando Ritoku,
Kamada Keiichi
Publication year - 2007
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.20293
Subject(s) - beam (structure) , waveform , relativistic electron beam , cathode ray , current (fluid) , physics , electron , limiting current , radius , coaxial , atomic physics , optics , space charge , vacuum tube , materials science , electrical engineering , voltage , nuclear physics , electrode , engineering , computer security , composite material , quantum mechanics , computer science , electrochemistry , thermodynamics
Experiments on transformation of energy and beam current waveforms of an intense relativistic electron beam were carried out. An intense electron beam with energy of 500 keV, current of 3 kA, and duration of 12 ns was injected into a drift tube. A coaxial cavity connected with the drift tube via a gap was utilized to transform the time evolution of electron energies of the beam. The scheme is the same as the autoacceleration except the cavity length. The former part of the beam with the duration of the round‐trip time of the cavity lost the energy and the following part of the beam with the same duration gained the energy. A cylindrical cavity with large radius was located behind the coaxial cavity to change the time evolution of the current waveform of the beam. The injected beam current larger than the space charge limiting current at the cavity was decreased gradually to the limiting current by elongating the cavity length. Trapezoidal waveforms of injected electron energy and beam current were transformed to the time‐increasing waveforms after the cavities. © 2007 Wiley Periodicals, Inc. Electr Eng Jpn, 160(2): 1–8, 2007; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20293